Baird's sandpiper

The Baird's sandpiper is a very small shorebird. Adults have black legs and a short, stout, straight dark bill. They are dark brown on top and mainly white underneath with a black patch on the rump. The head and breast are light brown with dark streaks. In winter plumage, this species is paler brownish gray above. This bird can be difficult to distinguish from other similar tiny shorebirds; these are known collectively as "peeps" or "stints". This is what happened to me actually; I had originally identified this spotting as being Semipalmated Sandpipers (Calidris pusilla).